Block client writes if not possible perform sync replication

Hello,

Is it possible to temporarily block NFS client writes if DRBD can’t perform sync replication for NFS server to secondary node ?, for instance, if primary node is rebooting ?

If the Primary node is rebooting, how is DRBD accepting writes? If the DRBD Primary is rebooting, DRBD should be demoted to a Secondary first, and therefore not accept any writes.

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